xom报错 Exception in thread "main" java.net.UnknownHostException: file

Exception in thread "main" java.net.UnknownHostException: file
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.Socket.connect(Socket.java:579)
    at java.net.Socket.connect(Socket.java:528)
    at sun.net.ftp.impl.FtpClient.doConnect(FtpClient.java:958)
    at sun.net.ftp.impl.FtpClient.tryConnect(FtpClient.java:918)
    at sun.net.ftp.impl.FtpClient.connect(FtpClient.java:1013)
    at sun.net.ftp.impl.FtpClient.connect(FtpClient.java:999)
    at sun.net.www.protocol.ftp.FtpURLConnection.connect(FtpURLConnection.java:294)
    at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream(FtpURLConnection.java:393)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:613)
    at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:189)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:812)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
    at nu.xom.Builder.build(Unknown Source)
    at nu.xom.Builder.build(Unknown Source)
    at xml2.XOM.main(XOM.java:26)

package xml2;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import nu.xom.Builder;

import org.xml.sax.XMLReader;

public class XOM {
    public static void main(String[] args) throws Exception {
        SAXParserFactory factory = SAXParserFactory.newInstance();
        factory.setValidating(false);
        factory.setNamespaceAware(true);

        SAXParser parser = factory.newSAXParser();

        XMLReader reader = parser.getXMLReader();
        reader.setErrorHandler(new SimpleErrorHandler());

        Builder builder = new Builder(reader);
        builder.build("contacts.xml");

    }
}

为什么会报这个错误呢？我用的是xom-1.2.10.jar

package xml2;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import nu.xom.Builder;

import org.xml.sax.XMLReader;

public class XOM {
    public static void main(String[] args) throws Exception {
        SAXParserFactory factory = SAXParserFactory.newInstance();
        factory.setValidating(false);
        factory.setNamespaceAware(true);

        SAXParser parser = factory.newSAXParser();

        XMLReader reader = parser.getXMLReader();
        reader.setErrorHandler(new SimpleErrorHandler());

        Builder builder = new Builder(reader);
        builder.build("file:\H:\mycodes\java\jbpm\xml2\contacts.xml");

    }
}

从xom-1.2.10.jar开始使用file协议，挺不方便的